Tool-holder for lathes.



N0. 764,466. PATENTD JULY 5, 1904. S. HENRY.

'I'OL HULDER FR LAILHES.

APPLIOATION FILED APE, 14, 190s. NO MODEL.

FWM u; N .A5

UNITED STATES aterited July 5, 1904.

JOHN S. HENRY, OF STONINGTON. CONNECIIGUT.

TOOL-HOLDER FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 764,466, dated July 5,1904.

Application filed April 14, 1903. Serial No. 152,608. (No model.)

To all whom t may con/cern:

Be it known that I, J onN S. HENRY, a citizen of the United States,residing at Stonmgton, in the county of New London and State ofConnecticut, have invented a new and use ful Tool-Holder for Lathes, ofwhich the following is a specification.

This invention relates to tool-holders for lathes, and more especially7to tool-holders for metal-turning lathes.

In turning any article upon an ordinary metal-turning lathe the commonpractice is to take ofi' a roughing chip with one form of tool, then totake off a finishing chip with another kind of tool, and finally tosquare up the work in order to complete it.

The object of this invention is to provide an improved tool-holder forlathes in which the various tools required to perform the severaloperations necessary to complete the turning of an article may besupported and the tool-holder so shifted in position after thecompletion of each step in the turning operation that the entireoperation may be performed without removing the work from the arbor ofthe lathe.

A further object of the invention is to improve tool-holders of the typeabove specified by providing means to prevent absolutely any undesiredmovement of the tool-holder during the turning operation.

A further object of the invention is to provide a tool-holder of theclass above mentioned with a positive and automatic locking device tohold the movable tool-supporting member in proper relation to the baseof the toolholder.

`With the above-stated objects and others in view, which ivill appear asthe invention is better understood, the same consists in theconstruction and combination of parts of a tool-holder hereinafterdescribed and claimed, and illustrated in the accompanying drawings,forming a part of this specification, in which corresponding parts aredesignated by the same characters of reference throughout the `variousviews,it being understood that changes may be made in the exact form,proportions, and exact inode of assemblage of the elements thereinexhibited without departing from the spirit of the invention orsacrilicing any of its advantages.

In the drawings, Figure l is a top plan View of the tool-holdersupported upon a rest adapted to be mounted upon any ordinary 'forni ofturninglathe- Fig. 2 is a vertical section through Fig. l on the line 22. Fig. 3 is a detail view showing the means employed for preventingdisengagement of the rotatable portion of the tool-holder from the base.Fig. l is a detail view showing the arrangement of the sockets aroundthe lower portion of the movable tool-supporting member.

Referring to the drawings by reference characters. 1 designates therest, provided on its upper surface with a longitudinally-dis posedgroove undercut on either side, as at 2.

3 designates the base of the tool-holder, which is preferably ofsubstantially circular outline and provided with an arm l at one side.The base 3 has on the under surface thereof a rib 5, (seen incross-section in Fig. 2,) adapted to fit the upper portion of the groovein the rest l. The base 3 has a central opening 6, through which extendsthe locking-bolt 7, having a square head 8, adapted to engage theundercut portions 2 of` the groove in the rest, as best seen in Fig. 2.The threaded end of the bolt 7 projects upward through the base portion3 and has screwed thereon a nut 9, by means of which the bolthead isclamped lirmly against the undercut portions 2, above mentioned, and thebase 3 is held in rigid association with the rest 1. On the uppersurface of the base 3 there is provided an annular groove 10, at theouter edge of which there is an upwardly-disposed flange 11, which risesabove the central part of the upper surface of said base 3. ln threadedengagement with sockets provided in the flange 11 are a plurality ofsmall set-screws l2, having pointed ends, as best seen in Fig. 3, andadapted to engage a V-shaped groove 13 on the outer surface of themovable tool-supporting member 14 near the bottom thereof, as seen inFigs. S2 and 3.

The movable tool-supporting member 14 is provided at the bottoni with adownwardlyprojecting flange 15, which lits a groove prow vided on theupper surface of the base o and IOO 13, provided on the member 14. ThisV-v shaped groove extends circumferentially around the flange 15, whichalso has provided on its outer surface at equal intervals sockets 16 forthe engagement of a spring-pressed locking-bolt 16, slidably mounted inthe arm 4 of the base 3 and normally held in engage-l ment with a socketon the member 14 by a spring 17, mounted in the arm 4, as seen in Fig.2, and held in operative position by a screwplug 18.

. Projecting radially from the tool-supporting member 14 at equalintervals are toolsockets 19, each of which is provided with a screw 2Oin threaded engagement with an opening provided therefor in the upperportion of the tool-socket. Each of the toolsockets has an opening 21extending radially outward and having a slight upward inclination towardits outer end, as best seen in Fig. 2, in order to give considerablerake to the tool mounted therein.

The tools 22, 23, and 24,mounted in the toolsockets 19, are of similarconfiguration as to shank, but have differently-shaped cutting ends toadapt them to the different kinds of work to be done by the varioustools.

In order to hold the tool-supporting member 14 in practically firmcontact with the base 3 during' the turning operation, the member 14 iscentrally bored at the top, as indicated at 25, and a bolt 26, having ahead 27 provided with ears 28 for convenience in turning it, is looselycarried in said bore, the threaded portion of the bolt being adapted toengage with internal threads in a socket 29 provided in the bolt. Bymeans of bolt 26 when the member 14 has been brought into the desiredposition it can be clamped into close contact with the base, so thatthere will be no relative movement of member 14 and base 3 during theturning operation, thus doing away with the rattling that wouldotherwise occur and insuring more perfect action of the tools during theturning operation.

For convenience in indicating' the amount of inclination of theturning-tool to a line normal to the axis 0f rotation of the work thespace between each pair of tool-sockets is graduated in the manner shownin Fig. 1, the Zero-point being placed at the middle of each space andthe graduations reading each way from said point.

For convenience in turning' the movable member 14 on the base 3 athreaded socket 30 is provided on the outer surface of the movablemember 14 between each pair of toolsockets, and a handle 31 (indicatedin dot-and dash lines in Fig. 2) is provided to engage with said socket.l

In using my improved tool-holder it is mounted upon the tool-holder rest1 on the lathe, as above explained, and the tool which it is desired toemploy is brought into position to engage the work on the arbor bywithdrawing the spring-pressed locking-bolt from engagement with thesockets in the movable member 14 and turning said member 14 to thedesired position. If one of the sockets 16 is then in position to beengaged by the locking-bolt, the bolt will automatically enter thesocket as soon as it is released, and the tool-holder will then be heldagainst rotation in the groove provided on the top of the base 1.Invorder to prevent any rattling and all vertical movement of thetool-holder during the turning operation, the bolt 26 should be screweddown, so as to clamp the member 14 against the base 3. If when the toolis in desired position to engage the work one of the sockets 16 is notin position to be engaged by the locking-bolt 16, the clamping-bolt 26may be employed to hold the movable member 14 in the desired positionwithout aid from locking-bolt 16a. lVhen, as is sometimes the case, itis desirable to move the member 14 so as to shift the tool during theturning operation, the locking-bolt 16*1 may be kept out of engagementwith one of the sockets 16 and the clamping-bolt 26 loosened justsuiiicient to permit the member 14 to be rotated on the base 3. by meansof the handle 31, which may be screwed into one of the sockets 30provided on the outer surface of movable member 14.

As the tool-sockets 19 are disposed radially from the center of themember 14, all the tools supported in said sockets may be presented towork at the same inclination, thus making it unnecessary to shift theposition of the toolholder on the rest in order to change from IOO onetool to another at the end of each step in the turning operation.

It will be observed that by mounting the movable toolsupporting member14 in a groove upon the Lipper surface of the base 3 and providing thelocking-bolt 16 and clamping-bolt 26 an extremely rigid construction isobtained, as the lateral movement of member 14 in any direction isprevented by the flange external to the groove on the base 3, and rotaryand vertical movement of the member 14 are prevented by means of thelocking-bolt and clamping-bolt, respectively.

Having thus described the construction and operation of my invention,what I claim as new, and desire to secure by LettersIatent, is

1. The combination in a device of the class described, of a rest, a basesecured upon said rest and presenting on its upper surface an annulargroove surrounded by an upwardlyprojecting rim, a toolsupporting memberseated in said groove, retractable members provided in said rim forsecuring said toolsupporting member' in said groove for rotationtherein, and removable means for ciamping said tool-supporting memberupon said base, said tool-supporting member being susceptible or'removal from said base when said clamping means and the securing meansmounted in the rim are disengaged therefrom.

2. The combination in a device of the class described, of a rest, a baseupon said rest having a central opening, a boit having a head engagingthe rest and having in its upper end an internally-threaded socket, anut threaded upon the upper end of said bolt to secure said base inposition, a toolesupporting member rotatably seated on said base andhaving' a central chamber to receive the upper end of JOHN S. HENRY.

Vitnesses:

CHARLES H. GARITY, Josemi F. LEM-IY.

